Design And Research On Damping Device Of Nuclear Polar Crane

The nuclear power station crane(nuclear polar crane)is located directly above the reactor in the nuclear island.Its seismic performance is very important for the safety of nuclear power plant.Earthquake is one of the important factors limiting the safety and reliability of nuclear polar crane.The installation of shock absorber on the nuclear polar crane can significantly improve its anti-seismic performance.Taking a third generation of nuclear polar crane as an example,the finite element model of nuclear polar crane is established by using Hyper Mesh and ABAQUS.The most dangerous condition is determined by spectral analysis simulation.Then,the seismic device is installed in the trolley position of finite element model.According to the most dangerous condition,the influence of different stiffness of shock absorber on seismic performance of nuclear polar crane is analyzed by vertical response spectrum,Determine the appropriate damping device stiffness.Based on the experimental research of the elastic material of the shock absorber,the design of the shock absorber is completed.Finally,the time history analysis method is used to verify the shock absorption effect of the trolley shock absorber,and the design of the lifting shock absorber is completed.The main research contents are as follows:(1)The finite element model of nuclear polar crane is established by using the finite element software Hyper Mesh and boundary conditions are defined.The model is introduced into ABAQUS,and modal analysis and spectrum analysis are carried out in ABAQUS.(2)According to the seismic code and standard to be followed by nuclear polar crane,the simulation results are analyzed.The most dangerous conditions are determined by the stress of main beam and safety coefficient of each hoisting wire rope.(3)The vibration absorption effect of different stiffness of the shock absorber on the stress and hoisting wire rope of the main beam is analyzed by spectrum analysis method,and the appropriate stiffness is determined.(4)The installation position,space and maximum bearing capacity of the shock absorber are determined.The compression modulus,compression strength and Poisson ratio of the material of the shock absorber are measured by experiments and the damping device is designed.(5)Design the shock absorber of new trolley and trolley,and analyze the strength of the new trolley structure.(6)Because of the non-linear factors that cannot be analyzed in the spectrum analysis,the difference between the actual wire rope and the default rod element in the spectrum analysis is quite large.In the time history analysis,truss element is used to simulate the actual steel wire rope,and the multi-stage stiffness is used to simulate the travel of the actual trolley shock absorber,and the shock absorption effect of the shock absorber on the core ring crane is accurately analyzed.(7)On the basis of installing the shock absorber of the trolley,the suitable stiffness of the lifting shock absorber is studied by time history analysis and the lifting shock absorber is designed.The results show that the trolley shock absorber can effectively reduce the stress of the main beam,but the stress of the lifting wire rope increases slightly.The stress of the steel wire rope and the main beam can be reduced by adding the lifting shock absorber.The trolley and lifting shock absorber designed in this paper provide important reference for the design of the shock absorber for crane.